Andrew recently started hanging out with a group of peers who are all motivated to do well in school and are involved in academic extracurricular activities, such as the debate team and the science fair. Andrew's gravitation to this group of peers is known as:

selection

Explanation:

By contrast, socialization refers to a process of friends influencing one another, so that they become more similar over time. These processes are not necessarily exclusive or sequential, meaning that homophily among friends could occur through either selection or socialization at different points in a friendship

answer; /// i believe the correct answer is (when one group has an extremely high score at pretest;